The Lite-On LTR-306 Phototransistor is a side-view radial optical sensor designed for use in a variety of applications. It features a 940nm wavelength, a wide viewing angle of up to 120°, and a fast response time of less than 1ms. The LTR-306 is ideal for applications such as motion detection, proximity sensing, and light detection. It is also suitable for use in robotics, automation, and security systems. The LTR-306 is a reliable and cost-effective solution for a variety of sensing needs.